I can think of a few issues you might have, not all related to focus:
- Because the D7000's sensor is smaller than 35mm film, this will give the effect of cropping your images, or causing you to need to reach for a wider lens than your instincts might tell you. The obvious workaround is get a D600 instead but maybe the ship has already sailed on that.
- The aforementioned smaller sensor also means a smaller image in the viewfinder, which will make MF accuracy more difficult.
- The focusing screens in today's AF cameras are optimized for AF and don't have the focus aides like split-prisms that you're accustomed to from your MF film cameras. You can remedy this by installing a Katz Eye focusing screen, however this may affect the camera's meter.
- On the plus side, the camera's LiveView feature allows you to zoom in on the image read directly from the sensor in real time, which allows you to set focus as accurately as using a loupe on the ground glass of a view camera. This is only reasonable to do from a tripod however.
For my shooting, which is mostly fast-moving birds in flight and slow-moving landscapes from a tripod, I'd be lost without good AF for the former, but primarily use MF in conjunction with LiveView for the latter. Depending on what you shoot (if you choose to shoot some fast-moving action) you may find some serious advantage to AF. If you can however take your time, and work from a tripod using LiveView, then MF is actually the most accurate and consistent focus method.